[FEAT] `DaffProduct.in_stock` field should be required.

[lderrickable]

:bulb: Feature request

Feature Name

DaffProduct.in_stock field should be required.

The Desired Behavior

The DaffProduct.in_stock field should really be required. I think it is only optional right now to make it easier to test the transformers with data from a json file.

Your Use Case

The in_stock field is pretty much always needed.

[griest024]

Is in_stock needed for composites and configurables? I think @damienwebdev mentioned that pricing and in stock calculations would be different for comps and configs.